The National Institute of Standards and Technology (NIST) intends to procure repair services for a TA Instruments ARES-G2 rheometer, which is currently nonfunctional and critical for characterizing the rheological properties of various materials. The repair will be conducted on a sole source basis with TA Instruments, as they are the only authorized provider capable of servicing their proprietary equipment, ensuring compliance with specific calibration standards. This rheometer is essential for research that spans a wide temperature range, from -180 to 1500 °C, and is integral to NIST's operations. Interested parties may submit responses by 1:00 AM EST on June 13, 2025, to Erik Frycklund at erik.frycklund@nist.gov for consideration, although no solicitation package will be issued.